AirMobile - 25 - Installing sensor in its case

7 Feb 2015

The crucial moment is coming: installing the sensor in a real car

Before of that, all the components have been mounted in a case, as shown in pictures below.

Particular care has been taken to thermally insulate the electronics components from the heat. I placed some foam on the side that faces the car radiators. This, and the air that flows from the holes in the front-facing side of the case, should prevent electronics from overheating

Care has been taken in order to make the airflow slowdown inside the case, so that measure are not affected by air speed (especially for temperature and humidity) and particles concentration increases. The idea is that air enters through the tow holes (see picture below), passes through the hole in the dust sensor and then between the two boards, where sensors are mounted. Air have to bend by 90 degrees because of the back case and this should slow it down. This is just my thought, that needs to be proven by a test on field. It could worth the while to spend some time studying how to implement a simple model in one of free CFD software, just to have an idea of air speed and pressure...

The case will be installed at a certain distance from the radiator, whereas the Peltier cell needs to be placed in contact with the radiator itself.

To increase cell efficiency, I glued a PC heatsink to the clod face of the cell itself.

Parents

DAB over 9 years ago

Looks like you are almost ready to start making measurements.

DAB
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amgalbu over 9 years ago in reply to DAB

Yes i am almost ready
The main problem will be validation because i don't hahave any instrument for calibrating sensors
But first let's see if somesomething works
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DAB over 9 years ago in reply to amgalbu

If nothing else you can compare your readings against a clear air sample for a quick comparison.

Then you can compare those readings against other samples to gage good, better, best kind of comparison.

DAB
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amgalbu over 9 years ago in reply to DAB

Thanks!
Actually what I am realizing is that it's difficult for me to figure out what the values should be. For example, 10ppm of CO is good or not. So your suggestion is valuable indeed because confirms that probably a "relative" approach is better (from the user point of view) than an "absolute" approach. By "relative" approach I mean "CO ppms is greater here than there so air quality is better here than there"
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amgalbu over 9 years ago in reply to DAB

Thanks!
Actually what I am realizing is that it's difficult for me to figure out what the values should be. For example, 10ppm of CO is good or not. So your suggestion is valuable indeed because confirms that probably a "relative" approach is better (from the user point of view) than an "absolute" approach. By "relative" approach I mean "CO ppms is greater here than there so air quality is better here than there"
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